A group of international human rights activists called on the Canadian government on Thursday to look into allegations of mass murder and forced relocations at a Tanzanian mine now owned by Barrick Gold Corp. But the Canadian gold miner, which acquired the Bulyanhulu project as part of its 1999 acquisition of Sutton Resources Ltd., said the accusations are nothing more than ``a rehash of old allegations.'' The Lawyers' Environmental Action Team, based in Tanzania, said it has new evidence to support claims that thousands of small-scale miners were cleared from the gold-rich site and another group of 52 were buried alive in August 1996.